Groundwater from open wells in Sumba was collected and analysed for cations, trace elements, E.coli, anions and pesticides to determine its suitability for drinking. Physio-chemical parameters were also analysed. The obtained elements were compared against the trigger values in the Indonesian drinking water guidelines. For all groundwater collected, cation, trace elements and pesticide were below their respective trigger values. However, few wells tested positive for E.coli and calcium carbonate and hence possible remediation techniques to disinfect the wells are recommended.